40040100644 has 6 divisors (see below), whose sum is σ = 70070176134. Its totient is φ = 20020050320.

The previous prime is 40040100631. The next prime is 40040100647. The reversal of 40040100644 is 44600104004.

It can be written as a sum of positive squares in only one way, i.e., 30022492900 + 10017607744 = 173270^2 + 100088^2 .

It is not an unprimeable number, because it can be changed into a prime (40040100647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005012577 + ... + 5005012584.

It is an arithmetic number, because the mean of its divisors is an integer number (11678362689).

Almost surely, 2^40040100644 is an apocalyptic number.

It is an amenable number.

40040100644 is a deficient number, since it is larger than the sum of its proper divisors (30030075490).

40040100644 is a wasteful number, since it uses less digits than its factorization.

40040100644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010025165 (or 10010025163 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 40040100644 its reverse (44600104004), we get a palindrome (84640204648).

The spelling of 40040100644 in words is "forty billion, forty million, one hundred thousand, six hundred forty-four".